CN110320140A - CO2Imbibition experimental provision and method under effect - Google Patents
CO2Imbibition experimental provision and method under effect Download PDFInfo
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- CN110320140A CN110320140A CN201810292247.3A CN201810292247A CN110320140A CN 110320140 A CN110320140 A CN 110320140A CN 201810292247 A CN201810292247 A CN 201810292247A CN 110320140 A CN110320140 A CN 110320140A
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- 230000000694 effects Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005213 imbibition Methods 0.000 claims abstract description 105
- 239000000243 solution Substances 0.000 claims abstract description 96
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000002253 acid Substances 0.000 claims abstract description 93
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 93
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000011435 rock Substances 0.000 claims abstract description 53
- 238000002474 experimental method Methods 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 238000011084 recovery Methods 0.000 claims abstract description 31
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 26
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 15
- 239000012071 phase Substances 0.000 claims description 29
- 238000004519 manufacturing process Methods 0.000 claims description 26
- 239000007789 gas Substances 0.000 claims description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000007791 liquid phase Substances 0.000 claims description 15
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 238000011160 research Methods 0.000 abstract description 5
- 230000007246 mechanism Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 63
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 13
- 238000000502 dialysis Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000003079 shale oil Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012611 container material Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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Abstract
The present invention discloses a kind of CO2Imbibition experimental provision and method under effect, comprising: nitrogen gas container；CO2Container；Carbon acid solution container；Constant pressure injection pump, constant pressure injection pump respectively with nitrogen gas container, CO2Container is connected with carbon acid solution container；High-pressure bottle, the top of high-pressure bottle are equipped with lid, and lid is equipped with first outlet, and the upper portion side wall of high-pressure bottle is equipped with second outlet, and its underpart side wall is equipped with carbon acid solution entrance, first outlet respectively with nitrogen gas container, CO2Container connection, carbon acid solution container are connect with carbon acid solution entrance；The carbon acid solution entrance of gas-liquid separation device, gas-liquid separation device is connect with second outlet；Hypotonic, compact rock core imbibition experiment is carried out under high-temperature and high-pressure conditions, the oil for avoiding porous media saturated core imbibition from going out is attached to core surface, the measuring accuracy of volumetric method in imbibition oil recovery research is improved, for studying in CO2Under the conditions of imbibition act on raising recovery mechanism.
Description
Technical field
The invention belongs to oil development technical fields, more particularly, to a kind of CO2Effect under imbibition experimental provision and
Method.
Background technique
With the high speed development of U.S.'s pressure break and directed-drilling technique, shale oil gas revolution is have swept the globe, Chinese shale oil
Resource reserve is also very abundant, therefore the status of unconventional petroleum resources becomes more and more important, and improves recovery ratio for hypotonic, compact reservoir
The research of mechanism is increasing.CO2Drive is important method hypotonic, that compact reservoir improves recovery ratio.Due to hypotonic, compact reservoir
Since pore radius is smaller, there are stronger capillary pressure, therefore imbibition effect be it is hypotonic, compact reservoir improves recovery ratio most
One of dominant mechanism, therefore carry out CO2Low permeability cores imbibition experiment under effect is of great significance.
Imbibition oil recovery research method includes two class of mass method and volumetric method.Mass method is metering porous media quality to calculate
The method of fluid saturation in porous media, since mass method high degree of automation and precision are higher, application is wider, but this kind of side
Method is difficult to the imbibition being suitable under formation condition experiment.For the electronic balance built in high-pressure bottle, sensing element volume
It is relatively large, and the fluid of high temperature and pressure and complexity composition condition may influence the operating accuracy of sensing element；For external electricity
Sub- balance, mechanical-force-transmission device (such as: hydraulic load transfer device) may make testing result there is delay, in addition influence as a result, because
This carries out CO with mass method2Imbibition experiment difficulty under effect is larger.Volumetric method is the quality of the oily phase gone out by metering imbibition
Or volume, come the method for calculating oil production, since volumetric method is easily operated, application is wider, but such methods measuring accuracy is lower,
And the oil that imbibition goes out from porous media is mutually easy to be attached to rock core and show to influence measuring accuracy.In addition, also helping it
The method of fluid saturation in its rock core detection technique (such as: CT technology) measurement rock core, these methods are complicated for operation, cost compared with
Height, the relevant technologies under condition of high voltage are immature, are used for CO2The rock core detection for acting on lower imbibition experiment realizes that difficulty is larger.
Summary of the invention
In order to carry out the imbibition experiment of low permeability cores in the case where CO2 is acted on, the present invention provides a kind of CO2 effect lower imbibition reality
Experiment device and method, the device can carry out imbibition experiment under high-temperature and high-pressure conditions, by measuring the imbibition from porous media
The volume of oil out calculates imbibition recovery ratio, to study the imbibition effect of the unconventional rock core under CO2 effect.
To achieve the goals above, according to an aspect of the invention, it is proposed that a kind of CO2Imbibition experimental provision under effect,
The device includes:
Nitrogen gas container, the nitrogen gas container is for containing nitrogen；
CO2Container, the CO2Container is for containing CO2；
Carbon acid solution container, the carbon acid solution container is for containing carbon acid solution；
Constant pressure injection pump, the constant pressure injection pump respectively with the nitrogen gas container, CO2Container and carbon acid solution container connect
It connects；
High-pressure bottle, the top of the high-pressure bottle are equipped with lid, and the lid is equipped with first outlet, the high pressure-volume
The upper portion side wall of device be equipped with second outlet, its underpart side wall be equipped with carbon acid solution entrance, the first outlet respectively with the nitrogen
Gas container, CO2Container connection, the carbon acid solution container are connect with the carbon acid solution entrance；
The carbon acid solution entrance of gas-liquid separation device, the gas-liquid separation device is connect with the second outlet, the gas
The gas vent of liquid separating apparatus is equipped with aerometer meter, and the liquid outlet of the gas-liquid separation device, which is equipped with, produces liquid quantifier.
Preferably, the top of the high-pressure bottle is equipped with plunger, the lower surface of the upper surface of the plunger and the lid
Fitting, is equipped with sealing ring between the plunger and the inner tube wall of the high-pressure bottle, the plunger is equipped with through-hole, the through-hole
It is connected to first outlet.
Preferably, the high-pressure bottle is connected through a screw thread with the lid.
Preferably, back-pressure valve is respectively equipped at the first outlet and second outlet.
It preferably, further include backpressure pump, the back-pressure valve is connect with backpressure pump.
Preferably, the CO2Container is connect with the carbon acid solution container.
According to another aspect of the invention, it is proposed that a kind of CO2Imbibition experimental method under effect, the method includes as follows
Step:
Preparing experiment environment: the rock core for being saturated oil is put into the high-pressure bottle, by the nitrogen gas container to height
It is passed through nitrogen in pressure vessel with displacement air therein, the high-pressure bottle is warming up to reservoir temperature, and is pressurized to experiment pressure
Power is constant, and by the carbon acid solution container, into high-pressure bottle, constant pressure injects the height of carbon acid solution to second outlet, from the
One exports to high-pressure bottle injection CO2To second outlet height；
Start imbibition experiment, calculates imbibition recovery ratio: injecting CO into high-pressure bottle2, from second outlet discharge liquid phase and
Oily phase measures the imbibition oil production at each moment, measures accumulative imbibition oil production, calculates imbibition recovery ratio.
Preferably, described that CO is injected into high-pressure bottle2, mutually include: from second outlet discharge liquid phase with oil
It keeps the temperature and pressure in high-pressure bottle constant, CO is injected into high-pressure bottle2, from second outlet discharge liquor
Phase, until seeing gas；
It keeps the temperature and pressure in high-pressure bottle constant, injects carbon acid solution from carbon acid solution entrance to high-pressure bottle,
The oily phase gone out from second outlet discharge imbibition, until second outlet is no longer fuel-displaced.
Preferably, further includes:
Saturation distribution of the rock core containing original fluid is established according to requirement of experiment, measures original oil content in rock core；
The carbon acid solution is prepared with water flooding；
Preheat carbon acid solution, nitrogen and CO2。
Preferably, the imbibition recovery ratio is calculated according to the following formula:
Original oil content in imbibition recovery ratio=accumulative imbibition oil production/rock core.
Beneficial effect provided by the invention is: CO2Container, nitrogen gas container and carbon acid solution container pass through constant pressure injection pump
It connect, is simulated in CO with high-pressure bottle2The oily phase imbibition effect of saturated core under effect, gas-liquid separation device is to high-pressure bottle
The gas phase of discharge, liquid phase are mutually separated with oil, by gas dosing and produce liquid quantifier measure respectively the liquid phase after separating with
Gas phase measures the imbibition oil production at each moment in rock core porous media, and calculates accumulative imbibition oil production, which can be
Hypotonic, compact rock core imbibition experiment is carried out under high-temperature and high-pressure conditions, utilizes CO2Imbibition experimental provision under effect, avoids more
The oil that hole medium saturated core imbibition goes out is attached to core surface, and this method improves the metering essence of volumetric method in imbibition oil recovery research
Degree, for studying in CO2Under the conditions of the raising recovery mechanism that acts on of imbibition, method is easy to operate.
Other features and advantages of the present invention will then part of the detailed description can be specified.
Detailed description of the invention
Exemplary embodiment of the present is described in more detail in conjunction with the accompanying drawings, of the invention is above-mentioned and other
Purpose, feature and advantage will be apparent.Wherein, in the exemplary embodiment, identical reference label typically represents phase
Same component.
Fig. 1 shows the CO in one embodiment of the invention2The structural schematic diagram of imbibition experimental provision under effect.
Fig. 2 shows the CO in one embodiment of the invention2The flow chart of imbibition experimental method under effect.
Description of symbols:
1, nitrogen gas container；2,；CO2Container；3, carbon acid solution container；4, constant pressure injection pump；5, high-pressure bottle；6, lid；
7, first outlet；8, second outlet；9, carbon acid solution entrance；10, gas-liquid separation device；11, aerometer meter；12, liquid meter is produced
Meter；13, plunger；14, back-pressure valve；15, backpressure pump.
Specific embodiment
The preferred embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although being shown in attached drawing of the invention
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the present invention, without that should be limited by embodiments set forth here
System.On the contrary, thesing embodiments are provided so that the present invention is more thorough and complete, and can be complete by the scope of the present invention
Ground is communicated to those skilled in the art.
The embodiment of the present invention provides a kind of CO2Imbibition experimental provision under effect, comprising:
Nitrogen gas container, nitrogen gas container is for containing nitrogen；CO2Container, CO2Container is for containing CO2；Carbon acid solution container,
Carbon acid solution container is for containing carbon acid solution；Constant pressure injection pump, constant pressure injection pump respectively with nitrogen gas container, CO2Container and carbon
The connection of acid solution container；High-pressure bottle, the top of high-pressure bottle are equipped with lid, and lid is equipped with first outlet, high-pressure bottle
Upper portion side wall be equipped with second outlet, its underpart side wall be equipped with carbon acid solution entrance, first outlet respectively with nitrogen gas container, CO2Hold
Device connection, carbon acid solution container are connect with carbon acid solution entrance；Gas-liquid separation device, the carbon acid solution entrance of gas-liquid separation device
It is connect with second outlet, the gas vent of gas-liquid separation device is equipped with aerometer meter, and the liquid outlet of gas-liquid separation device is set
Have and produces liquid quantifier.
CO2Container, nitrogen gas container and carbon acid solution container are connect by constant pressure injection pump with high-pressure bottle, are simulated in CO2Make
The oily phase imbibition of saturated core under acts on, and gas phase, liquid phase and the oil that high-pressure bottle is discharged in gas-liquid separation device mutually carry out
Liquid and gas after separation are measured respectively by gas dosing and production liquid quantifier, are measured in rock core porous media by separation
The volume of the fuel-displaced phase of imbibition, the device can carry out hypotonic, compact rock core imbibition experiment under high-temperature and high-pressure conditions, avoid more
The oil that hole medium saturated core imbibition goes out is attached to core surface, improves the precision of volumetric method research imbibition oil production method.
Specifically, carbon acid solution container is used to prepare and contains carbon acid solution.
Water flooding is filtered with filter paper, to remove the solution gas in water flooding, by that carbonic acid is added is molten except the water flooding after air
Liquid container, by CO2It injects in carbon acid solution container, and increases temperature to 65 DEG C, increase pressure to experimental pressure 18MPa, prepare
Carbon acid solution.
Specifically, the main body of high-pressure bottle is a cylindrical pressure container, and the cylindrical pressure container material quality is preferred
For Hastelloy, the internal height of cavity is preferably 10~1000cm, and the inside diameter of cavity is preferably 3~40cm, wall
Thickness is preferably 1~5cm, and the pressure-bearing upper limit is preferably 40~100MPa.
The upper portion side wall of high-pressure bottle be equipped with second outlet, its underpart side wall be equipped with carbon acid solution entrance, second outlet away from
With a certain distance from having at the top of high-pressure bottle, and then guarantee that there are pneumatic jacks in experimentation, prevent oil to be mutually attached to container top.
Preferably, the top of high-pressure bottle is equipped with plunger, and the upper surface of plunger is bonded with the lower surface of lid, column
Sealing ring is equipped between plug and the inner tube wall of high-pressure bottle, plunger is equipped with through-hole, and through-hole is connected to first outlet, and plunger can
Improve the airtightness of high-pressure bottle, the high temperature and high pressure environment in simulated formation.
Wherein, the bottom of high-pressure bottle is the top cover composition of the metal can shut and top tape plunger.Top cap central has one
A plunger passes through top cover, and plunger is fixed on top cover by snap ring.Plunger center is equipped with through-hole, and through-hole and first outlet connect
It is logical, the cavity of cylindrical pressure container can be made to be connected to outside.
It is sealed between plunger and metal can with O-ring, there is threaded connection between lid and high-pressure bottle.
Preferably, high-pressure bottle is connected through a screw thread with lid.
Preferably, back-pressure valve is respectively equipped at first outlet and second outlet.
Specifically, back-pressure valve is used to control the pressure of first outlet and second outlet, and the pressure of high-pressure bottle is kept to stablize
Property.
It preferably, further include backpressure pump, back-pressure valve is connect with backpressure pump, for working as first outlet and second outlet
When exhaust or drain, keep the pressure in high-pressure bottle constant.
Preferably, CO2Container is connect with carbon acid solution container.
Specifically, water flooding, and and CO are put into carbon acid solution container2Container connection, needed for preparing under experimental conditions
Carbon acid solution.
According to another aspect of the invention, it is proposed that a kind of CO2Imbibition experimental method under effect, this method include following step
It is rapid:
Preparing experiment environment: the rock core for being saturated oil is put into high-pressure bottle, through nitrogen gas container into high-pressure bottle
Nitrogen is passed through with displacement air therein, high-pressure bottle is warming up to reservoir temperature, and it is constant to be pressurized to experimental pressure, passes through carbon
Acid solution container constant pressure into high-pressure bottle injects the height of carbon acid solution to second outlet, infuses from first outlet to high-pressure bottle
Enter CO2To second outlet height；
Start imbibition experiment, calculates imbibition recovery ratio: injecting CO into high-pressure bottle2, from second outlet discharge liquid phase and
Oily phase measures the imbibition oil production at each moment, measures accumulative imbibition oil production, calculates imbibition recovery ratio.
The rock core for being saturated oil is put into dialysis experiment container, then injects nitrogen from the first outlet at the top of high-pressure bottle
Gas is warming up to reservoir temperature, and is pressurized to experimental pressure, keeps experiment condition constant, by carbon acid solution from high-pressure bottle lower part
Carbon acid solution entrance constant pressure be added dialysis experiment container, remain unchanged pressure, nitrogen be discharged from first outlet by back-pressure valve
Gas, until first outlet water breakthrough；Then, container is wanted to inject CO from first outlet to height2, water phase is discharged from second outlet, until
Second outlet is shown in gas, completes the experimental situation prepared.
Use CO2Or the pressure in high-pressure bottle is improved 0.5MPa by carbon acid solution, keeps experiment condition constant, again from the
One exports to high-pressure bottle injection CO2, CO is injected into this time2At the time of initial time as imbibition experiment, it is fixed in experimentation
Phase measures the oil phase volume that imbibition goes out, and the oil production situation of change inscribed when recording each gradually decreases the inspection of dialysis oil production
Frequency measurement time draws imbibition oil recovery factor change curve until no longer oil-producing.
Specifically, saturated core height should be smaller than the distance of second outlet to high-pressure bottle bottom, to guarantee experimentation
Middle rock core is immersed in water phase.
Preferably, CO is injected into high-pressure bottle2, mutually include: from second outlet discharge liquid phase with oil
It keeps the temperature and pressure in high-pressure bottle constant, CO is injected into high-pressure bottle2, from second outlet discharge liquor
Phase, until seeing gas；It keeps the temperature and pressure in high-pressure bottle constant, injects carbon from carbon acid solution entrance to high-pressure bottle
Acid solution, the oily phase gone out from second outlet discharge imbibition, until second outlet is no longer fuel-displaced.
It keeps experiment condition constant, injects CO into high-pressure bottle from first outlet constant pressure2, from second outlet discharge liquor
Phase, until seeing gas；It keeps experiment condition constant, injects carbon acid solution into high-pressure bottle from carbon acid solution entrance constant pressure,
The oily phase gone out from second outlet discharge imbibition, until no longer fuel-displaced, and then displacement is attached to core surface and gas-liquid interface
Oil, measure cumulative oil production, calculate imbibition recovery ratio.
Preferably, this method CO2Imbibition experimental method under effect further include:
Saturation distribution of the rock core containing original fluid is established according to requirement of experiment, measures original oil content in rock core；
Carbon acid solution is prepared with water flooding；
Preheat carbon acid solution, nitrogen and CO2。
Specifically, the rock core of parameter and wetability is seeped in hole needed for being prepared according to requirement of experiment, water content including rock core and
Oil content, realizes the initial fluid saturation distribution for establishing rock core, cleans rock core, is extracted out the air in rock core with vacuum pump,
Experiment is pumped through to the rock core of vacuum with oil injection, original aqueous and oily saturation distribution is established, measures original oil content in rock core；
The carbon acid solution needed for water flooding under experimental conditions preparation experiment, under experimental temperature preheat carbon acid solution,
Nitrogen and CO2。
Preferably, imbibition recovery ratio is calculated according to the following formula:
Original oil content in imbibition recovery ratio=accumulative imbibition oil production/rock core.
Embodiment 1
Fig. 1 shows the CO in one embodiment of the invention2The structural schematic diagram of imbibition experimental provision under effect.
As shown in Figure 1, embodiment provides a kind of CO2Imbibition experimental provision under effect, comprising:
Nitrogen gas container 1, nitrogen gas container 1 is for containing nitrogen；CO2Container 2, CO2Container 2 is for containing CO2；Carbon acid solution
Container 3, carbon acid solution container 3 is for containing carbon acid solution；Constant pressure injection pump 4, constant pressure injection pump 4 respectively with nitrogen gas container 1,
CO2Container 2 and carbon acid solution container 3 connect, CO2Container 2 is connect with carbon acid solution container 3；High-pressure bottle 5, high-pressure bottle 5
Top is equipped with lid 6, and lid 6 is equipped with first outlet 7, and the upper portion side wall of high-pressure bottle 5 is equipped with second outlet 8, its underpart side
Wall be equipped with carbon acid solution entrance 9, first outlet 7 respectively with nitrogen gas container 1, CO2Container 2 connects, carbon acid solution container 3 and carbonic acid
Solution inlet 9 connects；The carbon acid solution entrance of gas-liquid separation device 10, gas-liquid separation device 10 is connect with second outlet 8, gas-liquid
The gas vent of separator 10 is equipped with aerometer meter 11, and the liquid outlet of gas-liquid separation device 10, which is equipped with, produces liquid quantifier
12。
The top of high-pressure bottle 5 is equipped with plunger 13, and the upper surface of plunger 13 is bonded with the lower surface of lid 6, plunger 13 and
Sealing ring is equipped between the inner tube wall of high-pressure bottle 5, plunger 13 is equipped with through-hole, and through-hole is connected to first outlet 7, high-pressure bottle
5 are connected through a screw thread with lid 6；Back-pressure valve 14 is respectively equipped at first outlet 7 and second outlet 8.
CO2The lower imbibition experimental provision of effect further includes backpressure pump 15, and back-pressure valve 14 is connect with backpressure pump 15, and being used for ought the
When one outlet 7 and the exhaust of second outlet 8 or drain, keep the pressure in high-pressure bottle 5 constant.
Embodiment 2
Fig. 2 shows one of one embodiment of the invention CO2The flow chart of imbibition experimental method under effect.
As shown in Fig. 2, embodiment provides a kind of CO2Imbibition experimental method under effect, this method comprises the following steps:
Preparation be saturated the oil rock heart: the full diameter coring rock core of shale is put into Muffle furnace be heated to it is 300 DEG C small more than 72
When, it decomposes rock core internal flow, gasification, then measures geometric dimension, quality, helium porosity and the gas-phase permeation of rock core
Rate；Rock core is put into corresponding clamper, is more than 2 days with the air in molecular pump extraction rock core, light crude oil is pressed into
Rock core increases temperature to 65 DEG C, increases pressure to 18MPa, the constant injection mother oil displacement of holding condition goes out the original of the lightweight in rock core
Oil, then aging rock core used mother oil displacement rock core to twice of pore volume again more than 1 month.
Preparing experiment environment:
Saturation distribution of the rock core containing original fluid is established according to requirement of experiment, measures original oil content in rock core；
Rock core is cleaned, the air in rock core is extracted out with vacuum pump, experiment is pumped through to the rock core of vacuum with oil injection, is established
Rock core is original aqueous and oil saturation is distributed, and measures original oil content in rock core；Carbon acid solution is prepared with water flooding；Preheat carbon
Acid solution, nitrogen and CO2；
The rock core for being saturated oil is put into high-pressure bottle, is passed through nitrogen into high-pressure bottle by nitrogen gas container with displacement
High-pressure bottle is warming up to reservoir temperature by air therein, and it is constant to be pressurized to experimental pressure, by carbon acid solution container to height
Constant pressure injects the height of carbon acid solution to second outlet in pressure vessel, injects CO from first outlet to high-pressure bottle2Go out to second
Open height；
The rock core for being saturated oil is put into high-pressure bottle, is passed through nitrogen into high-pressure bottle by nitrogen gas container with displacement
High-pressure bottle is warming up to reservoir temperature by air therein, and it is constant to be pressurized to experimental pressure, by carbon acid solution container to height
Constant pressure injects the height of carbon acid solution to second outlet in pressure vessel, injects CO from first outlet to high-pressure bottle2Go out to second
Open height；
Carbon acid solution is prepared with water flooding；Air will be removed to remove the solution gas in water flooding by filtering water flooding with filter paper
Water flooding afterwards is added in carbon acid solution container, by CO2Inject CO2In container, and temperature is increased to 65 DEG C, increase pressure to reality
Pressure 18MPa is tested, carbon acid solution is prepared.
Preheat carbon acid solution, nitrogen and CO2；The rock core for being saturated oil is taken out, measures saturation after removing the oil slick on surface
Core quality after oil and aging；The rock core for being saturated oil is put into high-pressure bottle, then from first outlet to high-pressure bottle
Nitrogen is injected, increases temperature to 65 DEG C, and increase pressure to experimental pressure 18MPa；Keep experiment condition constant, by carbon acid solution
Dialysis experiment container, which is added, from carbon acid solution entrance constant pressure remains unchanged pressure, and nitrogen is discharged from the first import by back-pressure valve
Gas, until first outlet water breakthrough；CO is injected from first outlet to high-pressure bottle2, water phase is discharged from the second import, until second goes out
Mouth is shown in gas, completes experimental situation and prepares.
Start imbibition experiment, calculates imbibition recovery ratio: injecting CO into high-pressure bottle2, from second outlet discharge liquid phase and
Oily phase measures the imbibition oil production at each moment, measures accumulative imbibition oil production, calculates imbibition recovery ratio.
Start imbibition experiment, calculates imbibition recovery ratio: injecting CO into high-pressure bottle2, from second outlet discharge liquid phase and
Oily phase measures accumulative imbibition oil production, calculates imbibition recovery ratio.
CO is injected into high-pressure bottle2, from second outlet discharge liquid phase and oily phase, keep the temperature and pressure in high-pressure bottle
Power is constant, and CO is injected into high-pressure bottle2, liquid phase is discharged from second outlet, until seeing gas；Keep the temperature in high-pressure bottle
Degree and pressure are constant, inject carbon acid solution from carbon acid solution entrance to high-pressure bottle, the oily phase gone out from second outlet discharge imbibition,
Until second outlet is no longer fuel-displaced；The imbibition oil production that each moment is measured with production liquid quantifier calculates accumulative imbibition and produces
Oil mass.
Use CO2High-pressure bottle pressure is improved into 0.5MPa, other experiment conditions are constant, from first outlet constant pressure into container
Inject CO2, liquid phase is discharged in second outlet, until seeing gas；Keep experiment condition constant, from carbon acid solution entrance constant pressure to appearance
Carbon acid solution is injected in device, the oily phase gone out from second outlet discharge dialysis, until no longer fuel-displaced, usual displacement 100mL.
CO will be injected2At the time of as imbibition experiment initial time, the oil production situation of change inscribed when recording each,
Calculate imbibition dialysis recovery ratio；The detection frequency of dialysis oil production is gradually decreased, until the oil production at certain moment is zero, draws and seeps
Sorptivety analyses recovery ratio change curve.
Wherein, the formula of imbibition recovery ratio are as follows: original oil content in imbibition recovery ratio=accumulative imbibition oil production/rock core.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.
Claims (10)
1. a kind of CO2Imbibition experimental provision under effect characterized by comprising
Nitrogen gas container, the nitrogen gas container is for containing nitrogen；
CO2Container, the CO2Container is for containing CO2；
Carbon acid solution container, the carbon acid solution container is for containing carbon acid solution；
Constant pressure injection pump, the constant pressure injection pump respectively with the nitrogen gas container, CO2Container is connected with carbon acid solution container；
High-pressure bottle, the top of the high-pressure bottle are equipped with lid, and the lid is equipped with first outlet, the high-pressure bottle
Upper portion side wall is equipped with second outlet, and its underpart side wall is equipped with carbon acid solution entrance, and the first outlet is held with the nitrogen respectively
Device, CO2Container connection, the carbon acid solution container are connect with the carbon acid solution entrance；
The carbon acid solution entrance of gas-liquid separation device, the gas-liquid separation device is connect with the second outlet, the gas-liquid point
Gas vent from device is equipped with aerometer meter, and the liquid outlet of the gas-liquid separation device, which is equipped with, produces liquid quantifier.
2. CO according to claim 12Imbibition experimental provision under effect, which is characterized in that the top of the high-pressure bottle
Equipped with plunger, the upper surface of the plunger is bonded with the lower surface of the lid, the inner cylinder of the plunger and the high-pressure bottle
Sealing ring is equipped between wall, the plunger is equipped with through-hole, and the through-hole is connected to first outlet.
3. CO according to claim 12Effect under imbibition experimental provision, which is characterized in that the high-pressure bottle with it is described
Lid is connected through a screw thread.
4. CO according to claim 12Imbibition experimental provision under effect, which is characterized in that the first outlet and second
Exit is respectively equipped with back-pressure valve.
5. CO according to claim 42Imbibition experimental provision under effect, which is characterized in that it further include backpressure pump, it is described
Back-pressure valve is connect with backpressure pump.
6. CO according to claim 12Imbibition experimental provision under effect, which is characterized in that the CO2Container with it is described
The connection of carbon acid solution container.
7. a kind of CO2Imbibition experimental method under effect, utilizes CO according to claim 1 to 62Under effect
Imbibition experimental provision, which is characterized in that described method includes following steps:
Preparing experiment environment: the rock core for being saturated oil is put into the high-pressure bottle, by the nitrogen gas container to high pressure-volume
It is passed through nitrogen in device, the high-pressure bottle is warming up to by reservoir temperature with displacement air therein, and is pressurized to experimental pressure not
Become, by the carbon acid solution container, into high-pressure bottle, constant pressure injects carbon acid solution to the height of second outlet, goes out from first
Mouth injects CO to high-pressure bottle2To second outlet height；
Start imbibition experiment, calculates imbibition recovery ratio: injecting CO into high-pressure bottle2, liquid phase and oily phase is discharged from second outlet,
The imbibition oil production at each moment is measured, accumulative imbibition oil production is measured, calculates imbibition recovery ratio.
8. CO according to claim 72Imbibition experimental method under effect, which is characterized in that described to be infused into high-pressure bottle
Enter CO2, mutually include: from second outlet discharge liquid phase with oil
It keeps the temperature and pressure in high-pressure bottle constant, CO is injected into high-pressure bottle2, liquid phase is discharged from second outlet, until
Until seeing gas；
It keeps the temperature and pressure in high-pressure bottle constant, carbon acid solution is injected from carbon acid solution entrance to high-pressure bottle, from the
The oily phase that two outlet discharge imbibitions go out, until second outlet is no longer fuel-displaced.
9. CO according to claim 72Imbibition experimental method under effect, which is characterized in that further include:
Saturation distribution of the rock core containing original fluid is established according to requirement of experiment, measures original oil content in rock core；
The carbon acid solution is prepared with water flooding；
Preheat carbon acid solution, nitrogen and CO2。
10. CO according to claim 92Imbibition experimental method under effect, which is characterized in that calculate according to the following formula
The imbibition recovery ratio:
Original oil content in imbibition recovery ratio=accumulative imbibition oil production/rock core.
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